Earlier this week, we reported the problem some users were having with their iPhone 5, where their Wi-Fi connections were slow and unreliable. Well, OS X Daily thinks it has the solution to your problem.
Some iPhone 5 users are experiencing a variety of issues with wifi on the device, almost always revolving around inconsistently slow wireless connections. If you’re having this problem, you’re not alone, and the good news is you can almost certainly get an immediate improvement by setting manual DNS on the device.
You can just use Google’s DNS Services for this (8.8.8.8 or 8.8.4.4), or follow the full process to find the fastest DNS servers. Either way, you should see an improvement.
How to find the fastest DNS Servers:
Leave Settings and run Speed Test, browse the web or try any online based activity using the Wi-Fi connection. It should be noticeably faster.
The theory is that the whole problem is a compatibility issue between the iPhone 5 and certain routers. This could be why not everyone has the problem, (I haven’t had the problem… Yet.), and why the same iPhone 5 will have problems with one network, and yet work fine on another.